Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window org.apache.directory.studio.ldapbrowser.help-2.0.0.v20210717-M17.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.